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I have a Logitech C615 web cam with a built-in microphone. I want to use a headset with earplugs and a microphone for more private conversations. There are phone out and mic in plugs on my Mac Mini.

However, I can not turn the sound off on the web cam. I can mute it, but the headset mic will not work.

Is there a way to turn off the sound on the web cam, or do I need to buy another one without the mic?

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You can easily change which device is used for audio input. Just hold down ⌥ Option while clicking on the Volume menu item:

Alternatively, to get a bit more fine control, open System Preferences (found under  > System Preferences…) and open the Sound preference pane:

enter image description here

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I added the Sound pane in System Preferences. Hope that's all right by you. :) – timothymh Mar 23 '12 at 0:23

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